Sources
Color Photographs of the Netherlands from the 1890s
A collection of photo postcards from the archive of the US Library of Congress.
Mashable published the selection of antique postcards that show the Netherlands in color in the late 19th century.
The images were obtained through a Photochrom process, invented in the 1880s by Hans Jakob Schmid of the Swiss publishing house Orell, Gessner, Füssli.
In order to create the final image they used the original negative to create several lithographic printing forms for each of the colors: their number varied between 6 and 15 depending on the required quality of rendering color.
Cover photo: Библиотека Конгресса
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